350 PHANEROGAMOUS PLANTS. 



19. IV A, Linn. 



1. IVA AXILLARIS, Ptirsh. 



Var. pubescens : pube villosa cinerea ; involucri cyatJiiformis squamis 

 usque ad apicem plerumque connatis. 



Ivafoliosa, Nutt. in Trans. Am. Phil. Soc. n. ser. 7, p. 346, forma pilosior. 



Hab. Bay of San Francisco, California.— A remarkable variety, 

 quite villous, with lax or spreading hairs ; also a specimen of the 

 normal type. Between the Spokane and the Okanagan Rivers, 

 Oregon; merely cinereous-pubescent; the involucral scales sometimes 

 connate to the summit, as in the variety, sometimes distinct half way 

 down. 



20. AMBROSIA, Tourn. 

 1. Ambrosia psilostachya, DC. 



Ambrosia psilostachya, DC. Prodr. 5. p. 526 ; Gray, PL Wright, 1, p. 104, & 2, p. 86. 

 A. Lindheimeriana & A. glandulosa, Scheele in Linnsea, 22, p. 156. 

 A. coronopifolia, Torr. & Gray, Fl. 2, p. 291. 



Hab. Bay of San Francisco, and on the Sacramento, California. 

 Also collected in California by Coulter. 



21. FRANSERIA, Com. 



1. Franseria Chamissonis, Less. 



Hab. Gray's Harbor, Washington Territory, and Bay of San Fran- 

 cisco, California ; the var. cuneifolia, Torr. & Gray, or F. cttneifolia, 

 Nutt. We have not yet seen any specimens with roundish-elliptical 

 leaves. 



